Sheath rot is one of the most destructive emerging diseases of rice in Asia and a significant loss (20–85%) to rice production is caused by this disease under temperate agro-climatic conditions of Kashmir. Disease is more prevalent in higher belts of valley where Japonica rice cultivation is more common. Also, late-maturing varieties are more likely to be attacked by sheath rot disease of rice. Information regarding the occurrence and distribution of any pathogen and its variability in the field is very much essential to devise a suitable disease management programme against the particular pathogen. The isolates of Sarocladium oryzae tested in the present study exhibited considerable variation in cultural characteristics, morphology and pathogenicity. The resistant sources for sheath rot disease of rice were identified among the temperate germplasm of rice under a relatively high inoculum concentration and disease pressure of all the variable isolates of S. oryzae. Among 219 rice genotypes screened for resistance against S. oryzae under field conditions, 42 genotypes were further evaluated under controlled epiphytotic conditions against all the 18 isolates of S. oryzae. Four genotypes (SKUA-354, ORN-V4, GS-183, GS357) were finally selected with high resistance against sheath rot disease of rice which can be utilized as potential donors for the development of disease-resistant varieties of rice against sheath rot.

In this paper we present a three-stranded investigation of all ‘archaeological islands’ (including crannogs) across Scotland, with a particular focus on the Outer Hebrides. The first strand is a synthesis and critical review of the archaeological record relating to 582 ‘archaeological island’ sites. This research enabled us to characterise the nature of any previous work (including dating evidence) undertaken on each, and thus to establish the first ever open access, holistic, accurate dataset of these sites. The second strand is new underwater survey carried out at 30 archaeological islands across the southern Outer Hebrides. This enabled us to acquire further information about and dating evidence for these sites; notably, this included new evidence for Neolithic occupation on three, increasing the total of known Neolithic islets in the region to 11. The third strand involved a thorough re-assessment of a wide body of archaeological literature relating to early excavations and finds. This research identified potential Neolithic material culture on a further 15 archaeological islands across the rest of Scotland. We conclude by discussing the potentially very significant implications of this early material, considering the possibility that crannogs could have been constructed in the Neolithic beyond the Outer Hebrides.

An accurate and efficient sampling method is an important tool for insect pest management because it allows for consistent measurements across many samples. There are currently no proposed standardised sampling plans or spray thresholds for the aphid Ericaphis fimbriata Richards (Hemiptera: Aphididae) on highbush blueberry (Vaccinium corymbosum Linnaeus) in British Columbia, Canada, despite it being the primary vector for blueberry scorch virus (BlScV). A standard sampling plan for this pest would allow for rapid and consistent measurements of aphid abundance in commercial fields and would allow for more detailed study of the relationship between aphid abundance, damage, and the spread of BlScV. Binomial sampling plans use the presence:absence of a pest within a sample unit to estimate the proportion of infested sample units. Pest density (proportion of measured samples with individuals present) is linked to abundance (number of individuals), and the relationship between these two measures can be modelled mathematically. In the present study, we collected data on aphid density and aphid abundance in six varieties of highbush blueberry grown in the Fraser Valley, British Columbia. These data were used to construct a distribution-free binomial model that, when given a measure of aphid density, can predict aphid abundance within a given sample.

We investigate the equation $D=x^4-y^4$ in field extensions. As an application, for a prime number p, we find solutions to $p=x^4-y^4$ if $p\equiv 11$ (mod 16) and $p^3=x^4-y^4$ if $p\equiv 3$ (mod 16) in all cubic extensions of $\mathbb{Q}(i)$.

Plastic pollution in the Arctic marine system is sparsely quantified, and few enforceable policies are in place to ameliorate the issue. With an inflow-outflow budget for the Arctic Ocean, we identify gateways through which plastic enters and exits the Arctic marine system. While estimating the flux of plastic through rivers, sea ice, and ocean, we also quantify marine plastic pollution from Arctic shipping and fishing. Plastic fluxes are calculated using horizontal volume fluxes of water and ice and combining them with plastic waste concentration data; flux from fishing and shipping is generated through combining waste estimates with estimated ship traffic. We estimate that fishing and shipping contribute 105 tonnes of plastic flux per annum, compared to 10−1 tonnes per annum from river inflow. The ocean has a far smaller net outflow, dwarfed by that of ice, at 10−8 to 10−7 and 10−5 to 10−3 tonnes per annum, respectively. We examine how a suite of proposed policy interventions would quantitatively change those concentrations, and how the current governance environment makes each feasible; we find interventions targeting vessel traffic most effective. These interventions include a prohibition on the use of certain plastics in fishing as well as a Polar Code permitting scheme.

In an attempt to counteract the silence of Exeter’s late sixteenth-century cartographic representation and to explore further the idea of urban social relations expressed in auditory terms, this article investigates the issues involved in the ringing of Exeter’s civic bells, some of which may reflect a fractious relationship between two sources of authority within the city walls. It sets out some of the challenges to recreating this city’s broader sonic identity and outlines the results of initial attempts to do so.

In the early 2000s, California-based Guayakí popularized the caffeinated drink, yerba mate, among young people and creative types. With revenues of $100 million, Guayakí dominates the U.S. market where it is synonymous with yerba mate. This essay explores how Guayakí transformed a foreign product with deep local meaning, widespread popularity, and a long history in southern South America from a shared beverage and social practice into a healthy energy drink. Typically, localization entails multinational companies and local consumers adapting and giving new meanings to an exotic foreign product or brand. In contrast, local entrepreneurs radically changed yerba mate while preserving part of its narrative. Guayakí promotes product authenticity based on a narrative of South American Indigenous origins, stimulating qualities, and health benefits that fits with superfoods, while a narrative of green capitalism promotes brand authenticity. But that was not enough to popularize yerba mate. The product had to be adapted to consumer taste preferences and values that challenge the foundational ideas of superfoods and green capitalism. As a result of consumer input acquired through grassroots marketing, Guayakí transformed a shared infusion into something closer to a soft drink—a pre-prepared, individual-sized beverage served in a single-use bottle or can with flavoring and sugar levels tailored to U.S. consumers. The essay exposes the role of local entrepreneurs and consumers in shaping product development and localization. It complicates our understanding of product authenticity and brand authenticity while exposing the limitations of green capitalism, ethical consumerism, and activist entrepreneurship.

To every finite metric space X, including all connected unweighted graphs with the minimum edge-distance metric, we attach an invariant that we call its blowup-polynomial $p_X(\{ n_x : x \in X \})$. This is obtained from the blowup $X[\mathbf {n}]$ – which contains $n_x$ copies of each point x – by computing the determinant of the distance matrix of $X[\mathbf {n}]$ and removing an exponential factor. We prove that as a function of the sizes $n_x$, $p_X(\mathbf {n})$ is a polynomial, is multi-affine, and is real-stable. This naturally associates a hitherto unstudied delta-matroid to each metric space X; we produce another novel delta-matroid for each tree, which interestingly does not generalize to all graphs. We next specialize to the case of $X = G$ a connected unweighted graph – so $p_G$ is “partially symmetric” in $\{ n_v : v \in V(G) \}$ – and show three further results: (a) We show that the polynomial $p_G$ is indeed a graph invariant, in that $p_G$ and its symmetries recover the graph G and its isometries, respectively. (b) We show that the univariate specialization $u_G(x) := p_G(x,\dots ,x)$ is a transform of the characteristic polynomial of the distance matrix $D_G$; this connects the blowup-polynomial of G to the well-studied “distance spectrum” of G. (c) We obtain a novel characterization of complete multipartite graphs, as precisely those for which the “homogenization at $-1$” of $p_G(\mathbf { n})$ is real-stable (equivalently, Lorentzian, or strongly/completely log-concave), if and only if the normalization of $p_G(-\mathbf { n})$ is strongly Rayleigh.

After-Action Reports (AARs) are retrospective summaries that capture key information and lessons learned from emergency response exercises and real incidents. The AAR is a commonly used evaluation tool used by the Centers for Disease Control and Prevention as part of the Public Health Emergency Preparedness (PHEP) program. It is used as a metric of accountability and awardee performance. The objectives of this study were to qualitatively analyze AARs of public health preparedness programs and develop a coding scheme for standardizing future review and analysis of AARs. We evaluated 14 AARs (4 exercises and 10 real incidents) generated between 2012 and 2018. We applied inductive qualitative analyses using ATLAS.Ti software. While, previous exercises focused on medical countermeasure responses, real-world incidents focused on natural disasters and infectious disease outbreaks. Six overarching themes emerged: Communications, Coordination, Resource Distribution, Unified Planning, Surveillance, and Knowledge Sharing. A standardized analysis format is proposed for future use.

Democratic governments produce more policies than they can effectively implement. Yet, this gap between the number of policies requiring implementation and the administrative capacities available to do so is not the same in all democracies but varies across countries and sectors. We argue that this variation depends on the coupling of the sectoral bureaucracies in charge of policy formulation and those in charge of policy implementation. We consider these patterns of vertical policy-process integration an important feature of bureaucratic quality. The more the policymaking level is involved in policy implementation (top-down integration) and the easier the policy-implementing level finds it to feed its concerns into policymaking (bottom-up integration), the smaller the so-called “burden-capacity gap.” We demonstrate this effect through an empirical analysis in 21 OECD countries over a period of more than 40 years in the areas of social and environmental policies.

We prove a large finite field version of the Boston–Markin conjecture on counting Galois extensions of the rational function field with a given Galois group and the smallest possible number of ramified primes. Our proof involves a study of structure groups of (direct products of) racks.